Four bits of config required:
nat44 add identity mapping external GigabitEthernet3/0/0 udp 53053
binary-api dns_name_server_add_del 8.8.8.8
binary-api dns_enable_disable
Inside network DHCP server needs to set option 6 (DNS name server) to the vpp
gateway address.
D.
-----Original Message-----
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of carlito nueno
Sent: Wednesday, August 14, 2019 11:46 PM
To: Carlito Nueno <carlitonu...@gmail.com>
Cc: vpp-dev@lists.fd.io
Subject: Re: [vpp-dev] Crash when using dns_name_server
Did a packet trace and I noticed two things:
dns4-request: DNS pkts pending upstream name resolution
nat44-out2in: no translation
Packet 8
00:28:11:659028: dpdk-input
lan1 rx queue 0
buffer 0x8aeef: current data 0, length 89, buffer-pool 0, ref-count 1,
totlen-nifb 0, trace 0x5
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 2, nb_segs 1, pkt_len 89
buf_len 2176, data_len 89, ol_flags 0x180, data_off 128, phys_addr
0xe64bbc40
packet_type 0x211 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
Packet Types
RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet
RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
RTE_PTYPE_L4_UDP (0x0200) UDP packet
IP4: a0:36:9f:3b:a2:b2 -> de:ad:00:00:00:05
UDP: 10.155.6.203 -> 10.155.6.1
tos 0x00, ttl 64, length 75, checksum 0x55ce
fragment id 0xc2d2, flags DONT_FRAGMENT
UDP: 33177 -> 53
length 55, checksum 0x96d9
00:28:11:659031: ethernet-input
frame: flags 0x3, hw-if-index 3, sw-if-index 3
IP4: a0:36:9f:3b:a2:b2 -> de:ad:00:00:00:05
00:28:11:659032: l2-input
l2-input: sw_if_index 3 dst de:ad:00:00:00:05 src a0:36:9f:3b:a2:b2
00:28:11:659033: l2-learn
l2-learn: sw_if_index 3 dst de:ad:00:00:00:05 src a0:36:9f:3b:a2:b2 bd_index 6
00:28:11:659034: l2-fwd
l2-fwd: sw_if_index 3 dst de:ad:00:00:00:05 src a0:36:9f:3b:a2:b2
bd_index 6 result [0x700000025, 37] static age-not bvi
00:28:11:659036: ip4-input
UDP: 10.155.6.203 -> 10.155.6.1
tos 0x00, ttl 64, length 75, checksum 0x55ce
fragment id 0xc2d2, flags DONT_FRAGMENT
UDP: 33177 -> 53
length 55, checksum 0x96d9
00:28:11:659037: nat44-in2out
NAT44_IN2OUT_FAST_PATH: sw_if_index 37, next index 3, session -1
00:28:11:659037: nat44-in2out-slowpath
NAT44_IN2OUT_SLOW_PATH: sw_if_index 37, next index 0, session -1
00:28:11:659038: ip4-lookup
fib 0 dpo-idx 10 flow hash: 0x00000000
UDP: 10.155.6.203 -> 10.155.6.1
tos 0x00, ttl 64, length 75, checksum 0x55ce
fragment id 0xc2d2, flags DONT_FRAGMENT
UDP: 33177 -> 53
length 55, checksum 0x96d9
00:28:11:659040: ip4-local
UDP: 10.155.6.203 -> 10.155.6.1
tos 0x00, ttl 64, length 75, checksum 0x55ce
fragment id 0xc2d2, flags DONT_FRAGMENT
UDP: 33177 -> 53
length 55, checksum 0x96d9
00:28:11:659041: ip4-local-end-of-arc
UDP: 10.155.6.203 -> 10.155.6.1
tos 0x00, ttl 64, length 75, checksum 0x55ce
fragment id 0xc2d2, flags DONT_FRAGMENT
UDP: 33177 -> 53
length 55, checksum 0x96d9
00:28:11:659041: ip4-udp-lookup
UDP: src-port 33177 dst-port 53
00:28:11:659042: dns4-request
DNS46_REPLY: pool index -1, disposition 6
00:28:11:659044: error-drop
rx:loop5
00:28:11:659044: drop
dns4-request: DNS pkts pending upstream name resolution
Packet 9
00:28:13:589187: dpdk-input
wan0 rx queue 0
buffer 0x504bc: current data 0, length 113, buffer-pool 0, ref-count 1,
totlen-nifb 0, trace 0x8
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 5, nb_segs 1, pkt_len 113
buf_len 2176, data_len 113, ol_flags 0x180, data_off 128, phys_addr
0xe5a12f80
packet_type 0x211 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
Packet Types
RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet
RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
RTE_PTYPE_L4_UDP (0x0200) UDP packet
IP4: 4a:1d:70:63:fc:d4 -> 06:35:31:eb:33:22
UDP: 8.8.8.8 -> 72.33.156.100
tos 0x20, ttl 122, length 99, checksum 0x94c7
fragment id 0x9ea9
UDP: 53 -> 53053
length 79, checksum 0x9c5e
00:28:13:589189: ethernet-input
frame: flags 0x3, hw-if-index 6, sw-if-index 6
IP4: 4a:1d:70:63:fc:d4 -> 06:35:31:eb:33:22
00:28:13:589190: ip4-input-no-checksum
UDP: 8.8.8.8 -> 72.33.156.100
tos 0x20, ttl 122, length 99, checksum 0x94c7
fragment id 0x9ea9
UDP: 53 -> 53053
length 79, checksum 0x9c5e
00:28:13:589191: nat44-out2in
NAT44_OUT2IN: sw_if_index 6, next index 0, session index -1
00:28:13:589192: error-drop
rx:wan0
00:28:13:589192: drop
nat44-out2in: no translation
Packet 10
00:28:13:590291: dpdk-input
wan0 rx queue 0
buffer 0x416b6: current data 0, length 236, buffer-pool 0, ref-count 1,
totlen-nifb 0, trace 0x9
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 5, nb_segs 1, pkt_len 236
buf_len 2176, data_len 236, ol_flags 0x180, data_off 128, phys_addr
0xe565ae00
packet_type 0x211 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
Packet Offload Flags
PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
Packet Types
RTE_PTYPE_L2_ETHER (0x0001) Ethernet packet
RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
RTE_PTYPE_L4_UDP (0x0200) UDP packet
IP4: 4a:1d:70:63:fc:d4 -> 06:35:31:eb:33:22
UDP: 8.8.8.8 -> 72.33.156.100
tos 0x20, ttl 122, length 222, checksum 0x3980
fragment id 0xf975
UDP: 53 -> 53053
length 202, checksum 0x0da9
00:28:13:590292: ethernet-input
frame: flags 0x3, hw-if-index 6, sw-if-index 6
IP4: 4a:1d:70:63:fc:d4 -> 06:35:31:eb:33:22
00:28:13:590293: ip4-input-no-checksum
UDP: 8.8.8.8 -> 72.33.156.100
tos 0x20, ttl 122, length 222, checksum 0x3980
fragment id 0xf975
UDP: 53 -> 53053
length 202, checksum 0x0da9
00:28:13:590294: nat44-out2in
NAT44_OUT2IN: sw_if_index 6, next index 0, session index -1
00:28:13:590294: error-drop
rx:wan0
00:28:13:590294: drop
nat44-out2in: no translation
On Wed, Aug 14, 2019 at 5:26 PM carlito nueno via Lists.Fd.Io
<carlitonueno=gmail....@lists.fd.io> wrote:
>
> VPP is not crashing anymore. I didn't change anything.
>
> VPP is caching DNS queries
>
> [P] DNS query: id 18
> no-recur recur-des no-trunc non-auth
> 2 queries, 0 answers, 0 name-servers, 0 add'l recs
> Queries:
> Name: www.apple.com: type A
> Name: www.apple.com: type AAAA
>
> But LAN device is not able to resolve any url LAN device is at
> 10.155.6.202
>
> dig @10.155.6.1 www.apple.com
>
> ; <<>> DiG 9.10.6 <<>> @10.155.6.1 www.apple.com ; (1 server found) ;;
> global options: +cmd ;; connection timed out; no servers could be
> reached
>
>
> On Wed, Aug 14, 2019 at 4:41 PM carlito nueno via Lists.Fd.Io
> <carlitonueno=gmail....@lists.fd.io> wrote:
> >
> > Hi all,
> >
> > I am trying to use DNS server and on "ping google.com" VPP is
> > crashing
> >
> > Aug 13 21:31:10 test1-vpp vnet[853]: unknown input `add_del 8.8.8.8
> > Aug 13 21:31:28 test1-vpp vnet[853]: dns cache: add / del / clear required..
> > Aug 13 21:31:36 test1-vpp vnet[853]:
> > vl_api_dns_resolve_name_reply_t_handler:2556: ip4 address
> > 23.75.7.244 Aug 13 21:32:24 test1-vpp vnet[853]: dns cache: add / del /
> > clear required..
> > Aug 13 21:34:43 test1-vpp vnet[853]: resolve_event:247: name server
> > 8.8.8.8 backfire
> >
> > When I try to restart it, it just hangs
> >
> > Aug 13 21:35:16 test1-vpp vnet[853]: unix_signal_handler:170:
> > received signal SIGCONT, PC 0x7f9bf5ff7e20 Aug 13 21:35:16 test1-vpp
> > vnet[853]: received SIGTERM, exiting...
> > Aug 13 21:35:16 test1-vpp systemd[1]: Stopping vector packet
> > processing engine...
> > Aug 13 21:35:16 test1-vpp vnet[853]: unix_signal_handler:170:
> > received signal SIGCONT, PC 0x7f9bf5ff7e20
> >
> > vpp.conf
> >
> > set int state wan0 up
> > set dhcp client intfc wan0 hostname vpp
> >
> > loopback create
> > set int l2 bridge loop5 6 bvi
> > set int ip address loop5 10.155.6.1/24 set int state loop5 up
> >
> > set int l2 bridge lan0 6
> > set int state lan0 up
> >
> > create tap id 5 host-ip4-addr 10.155.6.2/24 host-if-name lstack
> > host-ip4-gw 10.155.6.1 set int l2 bridge tap5 6 set int state tap5
> > up
> >
> > nat44 add interface address wan0
> > set interface nat44 in loop5 in out wan0
> >
> > nat44 add identity mapping external wan0 udp 53053 bin
> > dns_name_server_add_del 8.8.8.8 bin dns_name_server_add_del 8.8.8.4
> > bin dns_enable_disable
> >
> > DHCP server settings
> > OPTION: 6 ( 4) DNS server 10.155.6.1
> > OPTION: 3 ( 4) Routers 10.155.6.1
> >
> > Thanks!
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